i changed one line, i removed the <file ...> element and wrote
<createfolder/> (without it i couldnt compile)
existing web.config files will be correctly modified and by uninstall the
only the new modified conent will be deleted :)
BUT if no web.config files already exists, the setup crashs with (cant open
web.config file) :(

how to make a if, else or something like this?
if(web.config not exists)
<file...>
else
<createfolder/>

any ideas?
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